Type-writing machine.



members 22 mounted upon a shaft 23 pivotally supported infbrackets 24secured to the key lever fulcrum 2.5. One of these members22 is engagedby one end of a spiral spring ,26, so as normallyto hold the tensionmembers in forward position, as shown in Figs. 2 and 3, thereby holdingthe ribbon taut to expose the printing point. One of the members 22 isalso provided with a forwardly projecting arm 27 carrying a pin 28engaging a cam slot 29 at one end of an arm 30, adjustably secured as bymeans of set screws or the like 31, to a part 32 adjustably secured tothe universal rock shaft 19 as by adjusting screw 32UL passing throughthe split upper end thereof. The adjustment of this part 32 willdetermine the time at which the tension o n the ribbon will be relievedrelative to the movement of the type action. This cam slot is dividedinto two portions of different radii, separated by an intermediateshoulder 33. The portions of the' cam slot 29 are substantiallyconcentric to each other, having the axis of oscillation of the rockshaft 19 as a center. By means of this construction the key action ispermitted to have a certain `ramount of movement before the ribbontension members 22 are acted upon to relieve the tension of the ribbon.The pin 28 moves along one portion of the cam slot 29 before strikingthe shoulder 33, whereupon the tension members will be swung about theirpivotal support to release the tension upon the ribbon. As the typeaction completes its movement, the type carrier 2 will carry the ribboninto engagement with the paper, as shown in Fig. 4, and the rock shaft19 together with the parts secured thereto may continue their movementwithout changing the position ofthe ribbon tension members. On thereturn of the ty action to normal position7 the am mem er 30 will travelsubstantially half ofthe distance, or until the pin 28 trips over theshoulder 33, before the ribbon tensioning members 22 are returned. lnrapid operation of the machine the vuniversal. bar rarely returns to aposi tion of rest for the reason that before one key lever returns tonormal Aposition another key lever has already started on its downwardmovement. It is thus seen thatv the ribbon ltensioning members, whilenot4 positively maintained in their rearward position will notcompletely return tothe position shown in Fig. 1 at every operation -ofaV` type action, thus always more or less obscuring the printing pointWhile the machine -is in active operation, but immediately exposing thesame as4 soon asthe operator. stops. It is to be seen that the forwardportion `of-his cam slot 29.is made so as to t stud 28 accurately. Thisis to revent the take-up. arms or tension mem ers 2,2 from vibratinglandalso hmltingtheir rearward motion., The enlarged rear "u tien of camslot 29 permits the universal rock shaft 19 to which cam lever 30 isattached, to rotate, even though the ribbon take-up arms 22 should beprevented for any reason from returning to their normal position. Theribbon is carried away from the printing point to expose. the writingline, through the effort of spring 26, but if for any reason the ribbontake-up arms 22 should be obstructed so that they could not return ordraw the ribbon away from the printing line, the roll or stud 28 willremain on the upper side of cam slot 29 and cam lever 30, with universalrock shaft 19, will not be prevented from completing their movement.

When it is desired to change a ribbon,.

the ribbon tension members 22 dueto the lost motion connection with therock shaft 19 may be pressed forward without moving the universal barmechanism, as the pin 28 is permitted to move up and down in theenlarged portion of the cam 29. When the members 22 are in their forwardposition, the ribbon may be more quickly threaded through the slots inthe upper part of the ribbon guides 21.

The key lever 15 is fulcrumed on the fulcrum bar 25 and moves up anddown' in a comb member 34 at the forward part of the machine. A secondcomb member 35 is secured to the fulcrum bar 25 and holds the rear endof the key lever in place. This key lever is returned to normal positionby means of a spring 36, one end 37 of which passes through a hole inthe key lever at substantially right angles to thc body por tion, and isbent upwardly to engage thc side thereof. The body portion of the springengages the side of the key lever for a considerable distance and tendsto prevent a lateral movement thereof as the key lever is actuated. Theopposite end 39 of the spring is wound about a slightly tapered lorfrusto-conical pin 40 forming an integral part of a threaded member orscrew 41 in the comb 35. The resiliency of the spring tends to force thecoiled end downwardly upon the pin 40, thereby preventing a rotation ofthe screw 41 after the same has been placed in adjust.d position byacting v1 and 2, when a key lever is depressed the type carrier 2 willbemoved forwardly toward theplaten. The universal bar'l 16 will bedepressed to rotate the rock shaft l. sa'

ing a cam adapted to coact with said-.ribbonsaid ribbon may move tocover the printing point after the type carrier has moved apredetermined distance and to uncover the printing point when saidaction has returned a predetermined distance toward normal position.

9. In a visible typewritingmachine, in

combination, a platen roller, a type action including a type carrier anda key lever for actuating said type carrier, a universal rock shaftconnected with said key lever and actuated thereby, a ribbon normallyexposing the printing point, ribbon tension means for said ribbon, andmeans for moving said ribbon tension means toward the printing pointafter said type carriers have been partially actuated.

10. In a visible typewriting machine, in combination, a platen roller, atype action including a type carrier and a key lever for actuating saidtype carrier, a universal rock shaft connected with said key lever andactuated thereby, a ribbon normally held to expose the printing point, aribbon-holding means, and means adapted to actiiate said ribbon-holdingmeans whereby the ribbon covers the printing point after the typecarriers have moved a predetermined amount.

1l. In a typewriting machine, in combination, a. platen roller, a typeaction includ- .ing a front-strike type carrier anda key leierforactuating said type carrier, a universal rock shaft connectedwithsaid key lever and actuated thereby, a ribbon normally exposing theprinting point, pivotally mounted ribbon-holding" members, and a cammember connected with lsaid universal rock shaft adapted to actuatesaidribbonholding members to relieve the tension on the ribbon.

12. ln atypewriting machine, in combination, a platen roller,a typeaction including a front-strike type carrier and a key lever foractuating said type carrier, a universal rockshaft connected with saidkey lever and actuated thereby, a ribbon normally exposing the printingpoint, pivotally mounted ribbon-holding members, and

an adjustable'cam memberl operatively con-l nested with said universalrock shaft havholding members to move the same whereby the ribbon muvmove to cover the printing point when said typeaction is actuated.`

13. In a typewriting maehine,`in combi- 'nation,"a platen roller, a typeaction incliid- I l,an adjustable cam member adjiistably secured to saiduniversalrock sha ft liavinga cam adapted to coact with saidribbon-holding members whereby the ribbon may move to cover the printingpoint when the type action is actuated.

14. In a typewriting machine, in combination, a platen roller, aityp'eaction including a front-strike type carrier and a key lever foractuating said type carrier, a universal rock shaft connected 'With saidkey level` and actuated thereby, a ribbon, pivotally mountedribbon-holding members, and an adjustable cam member adjustably securedto said universal rock shaft having a cam adapted to coact with saidribbon-holding members whereby the ribbon is moved to cover the printingpoint when the type action is actuated and permit said ribbon- -holdingmembers to remain in their actuated position until sai'd type action haspartially returned to normal position.

15. In a typeivriting machine, in combination, a-platen roller, atypeaction includ- 'ing a front-strike type carrier and a key 16. Ina.typcwriting machine, in combination, a platen roller, a type actionincluding a iront-.strike type carrier and a key lever foi-actuatingsaid type carrier, a uni-- `versal rock shaft connected with said keylever and actuated thereby, a ribbomribbon guides therefor,pivotallymounted ribbontensioning members, a pin on said members, a cainmember adjustably secured to said universal rocksliaft having a caniadapted to coact with said pin, said cam having a shoulder intermediateits ends whereby said tensioning members arenioved only afterm said cammember has moved a predeter-` mined amount, and means whereby said pre.-

determined lamount may be regulated.

17.^1n a, typewriting machine, in combination, a platen rollen-a typeaction includling a front-'strike type carrier and a key lever foractuating said type carrier, a universal rock shaft connected with saidkey lever and actuated thereby, a ribbon normally int/e1 osed in thepath of said type carrier, ribbon guides therefor, pivotally mountedribbon-tensioning members, a. pin

, on said members, vand an adjustable cam member having :i cam adaptedto coact with "saidpin, said cani comprising two concentric portionswith a Vwhereby said tension 'members are actuated shoulder ytherebetween only after said cani member has moved a predeterminedamount.

18. In a typewrting machine, nlcombiinfinies nation, a platen roller, atype action includ ing a front-strike type carrier and a key lever foractuating said type carrier, a universal rock shaft connected with saidkey lever and actuated thereby, a ribbon, normally interposed in thepath of saidviippe carrier, ribbon guides therefor, pivotally mountedribbon-tensioning members, a pin on said members, and a cam memberadjustably connected Wit-h said luni'versal rock shaft having a cam slotadapted to coact with said pin, said slot having a shoulder intermediateits ends adapted to move said ribben-tension members to relieve thetension on said ribbon. K

19. In a typewritinglmachine, in combination, a platen roller, atypeaction including a front-strike type carrier and a. key lever foractuatin said type carrier, a universal rock sha' t connected With saidkey lever and actuated thereby, al ribbon 'nor'-` mally interposed inthe path of said type carrier, ribbon guides therefor, pivotally mountedribbon-tensioning members, a pin on said memberi.,v and a cam memberadjustably connected with said universal rock shaft having a cam adaptedto coact with said pin, said cam having a shoulder intermediate its endsadapted to move said tension members after the type action has beenmoved a predetermined amount and permit said members to remain in theiractuated position until said type action has partially returned tonormal position.

20. In a typewriting machine, in combination, a platen roller, a flatplaten adjacent said roller, a type action including a straightthrustfront-strike type carrier and a key lever for actuating said typecarrier, a universal rock shaft connected with said key lever andactuated thereby, a ribbon normally under tension and held to expose theprinting point, and means adapted to relieve the tension on the ribbonafter the type carrier has moved a predetermined distance whereby saidribbon may be moved to cover the printing point.

2l. lfn a typewritingi; machine, in combination, a platen roller, a flatplaten adjacent said roller, a "type action including a straight thrustpressure operated front strike type carrier and a key lever foractuating said type carrier, a universal rock shaft connected With saidkey 'lever and actuated thereby, a ribbon normally under tension andheld to expose the printing' point, ribbon guides for said ribbon, andmeans adapted to relieve the tension on the ribbon after said typeaction has been parti ally actuated whereby said ribbon is moved towardthe printing'point.

22. ln a typewriting machine, in combil nation, a vertically shiftab'lleplaten carriage, a rail along which said carriage travels, ribbon guidesmounted on said rail and shiftablewith said platen carriage, a typeaction, ribbon-tensioning means normally holding said 'ribbon so astoexpose the printing point, and means for actuating saidribbon-tensioning means to relieve the tension on the ribbon said typeaction.

. 23. In a typewriting machine, in combination, ay vertically shiftableplaten carriage, a rail along Which .aid carriage travels` ribbon guidesmounted on said rail and shiftable with said platen carriage, a typeaction, ribbon-tensioning` means normally holding said ribbon so as toexpose the printing point, and means for actuating said ribbontensioningmeans when said type action is actuated, said tensioning meanspermitting the ribbon to be shifted ,relatively thereto as said platenis shifted.

24. In a typewriting machine, in combination, a vertically shiftablcplaten carriage, a rail along which said carriagetravels. ribbon guidesmounted on said rail and shiftable with said platen carriage, a typeaction, ribbon-tensioning means normally holding said ribbon so as toexpose the printing point, and means for actuating said ribbontensioningmeans when said type action is actuated, said tensioning means ha vingtheir surfaces engaged by said ribbon curved in order to reduce thefriction therebet\.'een.

Q5. ln a typewriting,r machine, in combination. a vertically shiil'tableplaten carriage, a ,rail along which said carriage travels, ribbonguides mounted on said rail and shiftable with said platen carriage, atype action, ribbon-tensioning means normally holding said ribbon so asto expose the printing' point, and means for actuating' saidribbontensioning means when said type action is actuated, saidribbon-tensioning means being pivotally mounted and spring-held innormal position. l

26. In a typewriting' machine, in combination, a shiftable platencarriage having a platen roller mounted thereon, a rail along which saidcarri age is adapted to travel, ribbon `guides shil'table with saidcarriage, a ribbon passing through said guides, a type action, auniversal rock shaft, and means v connected with said universal rockshaft normallyholding' said ribbon under tension to expose the printingpoint.

27. In a typesvriting machine, in combination, a shiftable platencarriage havinga platen roller mounted thereon, a rail alongT which saidcarriage is adapted to travel, ribbon guides shi'ftable with saidcarriage, a

ribbon passingJ through said `guides, a type action, a universal rockshaft, means between the ribbon guides adapted to hold the ribbon undertension, and means whereby said ribbenfholding means. are actuated torelieve the tension on said ribbon when said type action is actuated. f

during the actuation of action, a universal rock sha 28. 'In atypewriting machine,iin combination, a shiftable platen carriage havinga platen roller mounted thereon, a rail 'along which saidV carriage isadapted to travel,

`ribbon guides shiftable with said carriage, a

ribbon passing through said guides, a type action, a universal rockshaft, a pivotally mounted tension member normally holding `the ribbonaway from the printing point,

and a lostmotion connection between said' universal rook shaft andsaidtension inem- A ber whereby the tension member is actuated torelieve the tension onsaid ribbon after the type action has been'partially actuated.

29.111 a'typewriting machine, in combination, a shiftable platencarriage having a and a lost motion. connection between said4 universalrock shaft and said'tension member whereby the tension member 1slactuated -lto relieve the Vtension on saidiribbon after -the typeaction has been partially actuated,

said tension member permitting the ribbon to be shifted relativelythereto as said car I riage is shifted.

30. In Aa typewriting machine, in combination, a'shiftable platencarriage having a, platen-roller mounted thereon, a rail along whichsaid carriage is adapted to travel, ribbon guides shitable with saidcarriage, a ribbon passing through said guides, a type action, auniversal rock shaft, a pivotally 'mounted tension member normallyholding the ribbon away from. the printing point, and a lost motionconnection between said universal rockshaft and said tension niemberwhereby the tension member is-'actuated to relieve the tension on saidribbon after the type action has been partially actuat'ed, said tensionmember having rounded surfaces vwhere engaged by said ribbon to relievethe .friction between said parts as the ribbonI is fed.

ln testimony whereof I alix my signature, inthe presence of twowitnesses.

NLS'H. ANDERSON. Witnesses:

CLARA A. Kansai?, Jos. Donn.

